Overview
The AD7715ARZ-3REEL, produced by Analog Devices Inc., is a comprehensive analog front end designed for low-frequency measurement applications. This 16-bit Sigma-Delta Analog-to-Digital Converter (ADC) is capable of accepting low-level input signals directly from transducers and outputting a serial digital word. It employs a Σ-Δ conversion technique to achieve up to 16 bits of no missing codes performance. The device features a programmable gain front end and an on-chip digital filter, allowing for adjustable filter cutoff and output update rates. It operates from a single supply voltage of either 3 V or 5 V and supports various input signal ranges, both unipolar and bipolar, making it versatile for different measurement scenarios.
Key Specifications
| Parameter | Description |
|---|---|
| Resolution | 16 bits, no missing codes |
| Supply Voltage | 3 V or 5 V |
| Supply Current | 450 µA maximum @ 3 V supplies |
| Input Signal Ranges | Unipolar: 0 mV to 20 mV, 0 mV to 80 mV, 0 V to 1.25 V, 0 V to 2.5 V; Bipolar: ±20 mV, ±80 mV, ±1.25 V, ±2.5 V |
| Programmable Gain | Gains of 1, 2, 32, and 128 |
| Digital Interface | Three-wire serial interface, SPI-, QSPI™-, MICROWIRE™-, and DSP-compatible |
| Package Options | 16-lead SOIC Wide, 16-lead PDIP, 16-lead TSSOP |
| Power-Down Mode | Standby power consumption: 50 µW typical |
| Nonlinearity | ±0.0015% |
| RMS Noise | <550 nV |
Key Features
- Differential analog input and differential reference input
- Programmable gain front end with gains of 1, 2, 32, and 128
- Low-pass filter with programmable output update rate
- Self-calibration and system calibration options to eliminate gain and offset errors
- CMOS construction for low power dissipation
- Three-wire serial interface for reduced interconnect lines and optocouplers in isolated systems
- Support for SPI-, QSPI™-, MICROWIRE™-, and DSP-compatible interfaces
- Ability to buffer the analog input
Applications
The AD7715 is ideal for use in various applications, including:
- Smart systems
- Microcontroller-based systems
- DSP-based systems
- Low-frequency measurement applications such as those involving strain gages or transducers
- Isolated systems where the three-wire serial interface reduces the need for optocouplers
Q & A
- What is the resolution of the AD7715?
The AD7715 has a resolution of 16 bits with no missing codes.
- What are the supply voltage options for the AD7715?
The AD7715 can operate from a single supply voltage of either 3 V or 5 V.
- What are the input signal ranges supported by the AD7715?
The AD7715 supports unipolar input signal ranges of 0 mV to 20 mV, 0 mV to 80 mV, 0 V to 1.25 V, and 0 V to 2.5 V, as well as bipolar ranges of ±20 mV, ±80 mV, ±1.25 V, and ±2.5 V.
- What types of packages are available for the AD7715?
The AD7715 is available in 16-lead SOIC Wide, 16-lead PDIP, and 16-lead TSSOP packages.
- How does the AD7715 manage power consumption?
The AD7715 has a low supply current of 450 µA maximum at 3 V supplies and a power-down mode that reduces standby power consumption to 50 µW typical.
- What is the nonlinearity of the AD7715?
The AD7715 has a nonlinearity of ±0.0015%.
- What is the RMS noise of the AD7715?
The AD7715 has an RMS noise of less than 550 nV.
- Does the AD7715 support calibration options?
Yes, the AD7715 includes self-calibration and system calibration options to eliminate gain and offset errors.
- What types of digital interfaces does the AD7715 support?
The AD7715 supports SPI-, QSPI™-, MICROWIRE™-, and DSP-compatible interfaces.
- Is the AD7715 suitable for isolated systems?
Yes, the AD7715 is suitable for isolated systems due to its three-wire serial interface, which reduces the need for optocouplers.
